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Plot of the optical electron energy-loss function of liquid water, Im[−1/ε (q = 0,ω)], as a function of energy loss h̄ω that was calculated from the optical constants of Segelstein [39] (for energies between 1.24 × 10−7 eV and 5.9 eV) and of Hayashi et al. [40] (for energies between 6.0 eV and 87.0 eV). For energies between 87 eV and 30 keV, optical constants of water were calculated from the photoabsorption data of Henke et al.[41].
